ci: correct invalid pinned action SHAs

[satyakwok]

Followup to the earlier SHA-pinning PR — the SHA lookup map had typos that pinned to non-existent commits, breaking workflow runs. This re-resolves each action ref against gh api repos/X/commits/Y and replaces with the verified SHA.

No semantic change vs the intended pinning; only fixes broken references.

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📥 Commits

Reviewing files that changed from the base of the PR and between eacf829 and 4b484ce.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/fix-pinned-shas

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